code: def test_cost(cache_seed):
      config_list = config_list_openai_aoai(KEY_LOC)
      model = "gpt-3.5-turbo-instruct"
      client = OpenAIWrapper(
          config_list=config_list, cache_seed=cache_seed
      )
      response = client.create(prompt="1+3=", model=model)
      print(response.cost)
  
file_path: autogen/test/oai/test_client.py
imports: import pytest
  from autogen import OpenAIWrapper, config_list_from_json, config_list_openai_aoai
  import sys
  import os
  from conftest import skip_openai
label_desc: Use image node_id 5 for calling a global function with example usage: test_cost(cache_seed) without return types